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Audere Classic 4-Band pre-amp install - Yamaha RBX 765A

Discussion in 'Pickups & Electronics [BG]' started by michaelandrew, Dec 29, 2012.

  1. michaelandrew

    michaelandrew The bass player is always right.

    I've just finished installing an Audere Classic 4-Band pre-amp in my Yamaha RBX 765A. The purpose of the exercise was to get rid of the crappy (IMO) stock Yamaha control pots and reduce hum and noise from the tone and balance controls. FWIW, I'm delighted with the result:D.

    For those interested, here's the Yamaha pre-amp in the control cavity. The controls are: balance, volume, bass and treble. The stock electronics are so noisy that the pick-up balance and tone controls have to be left near the centre positions:


    Here's the control cavity with the stock electronics removed and just starting to add copper shielding tape. The red/black wires are for the 9V battery and the two gray wires are 2-conductor cables for the pick-up "hot" and "return" wires. Other black wires are for bridge and pick-up cavity grounds. The green stuff is masking tape - just to protect against tool marks:


    The Audere pre-amp module controls are balance, volume, bass/mid-bass (stacked) and treble/mid-treble (stacked) - all pre-wired. The pot's are easy to install except that the holes for the stacked controls had to be drilled out about 1/32":


    Here, the pick-ups, power and grounds are all connected. The pre-amp module is the black thing under all the wires. One feature of the Audere is that the inputs are DC coupled so the pick-up returns are not connected to the cavity ground:


    Stuff all the wires back in and then put the cover back on. The wiring looks far more complicated that it is; the installation is really quite easy and Audere customer support is outstanding:


    The finished product with the the satin finish gold knobs:


    The noise and hum have all but vanished except when the balance is moved to the extreme limits - neck pup or bridge pup only. On this bass the treble control is so subtle that, at first, I wasn't sure it was working. The other 3 tone controls give plenty of cut or boost. Overall tone is very clean, transparent, and MUCH better than my playing deserves ;).
  2. jaxstarke


    Nov 6, 2010
    I know this thread is nearly a year old but you had mentioned in another thread about adding this preamp to an RBX765A. Looks pretty easy. An electronics expert I'm not nor do I want to be but this looks pretty harmless. I checked Audere out and I think I'll get one. Gonna stick with the 2 band though. Any more than that and I'll probably spend more time fiddling with knobs than actually playing.
  3. michaelandrew

    michaelandrew The bass player is always right.

    It's a simple install - just be sure to follow the Audere instructions and pay particular attention to the pre-amp ground connections; Audere is a little different from most in that respect. If you do run into any trouble, David, at Audere, was extremely helpful to me when I had some questions about the electronics. Have fun:).
  4. CaneyBoniface


    Feb 17, 2015
    the pickup is active or passive? i know the preamp is active. thank you
  5. JustForSport


    Nov 17, 2011
    Yamaha advertised as active, but I think the pickups are the same as in the RBX775- passive. Haven't seen any with a power wire yet.
  6. CaneyBoniface


    Feb 17, 2015
    ooo. thank you. i have a wiring problem. i saw some forum said that yamaha rbx375 fit with emg 45. but i never see the sample picture of it.
  7. daveman50

    daveman50 Supporting Member

    Feb 24, 2007
    Westchester County NY
    Aside from the crummy stock preamp, these are nice basses. A good mod.
  8. JustForSport


    Nov 17, 2011
    Not sure about the fit but EMGs are active unless 'hz' series.
    RBX375 is ceramic and RBX775 is alnico, both passive with 'active' preamp.
    CaneyBoniface likes this.